C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
42/10, 6/26
C09D 11/00 (2006.01) B41M 5/132 (2006.01)
Patent
CA 1050704
ABSTRACT OF THE INVENTION In accordance with certain of its aspects, the novel process of this invention for making pressure-sensitive record sheets comprises the steps of forming a dispersion of microcapsules containing a colour precursor solution, forming an aqueous mixture containing a colour developer for the encapsulated colour precursor; adding a colour suppressant to the dispersion of mircocapsules, to the aqueous mixture or partially to both in an amount or amounts effective to substantially prevent colour formation between the colour developer and any un- encapsulated colour precursor; the colour suppressant being a nitorgen containing basic organic compound selected from the group consisting of: amines, imines and aziridines; combining the aqueous mixture containing the colour developer, the colour suppressant and the microcapsules to form an aqueous coating composition; and applying the aqueous coating composition to a substrate in a single pass through substrate coating apparatus in accordance with certain other aspects of this invention, the novel product of this invention is an aqueous slurry for coating pressure-sensitive record sheets.
253510
Schwab Gerhart
Shackle Dale R.
Na
The Mead Corporation
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